6.5mm Pilot and Neck Reamer - Two tools for fast, easy removal of excessive neck thickness, or variation in case thickness. It guides the cutter over the sized cartridge case neck and is supported by the pilot reamer. The Auto Feed Attachment (for Case Trimmer 2 and Trim Pro) advances the cutting tool over the case neck with each turn of the trimmer handle. Not to be used with Trim Pro Power Case Trimmer.